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Oversampling PID controller for integration with a delta-sigma analog-to-digital converter

a technology of analog-to-digital converter and oversampling pid controller, which is applied in the direction of electric controllers, controllers with particular characteristics, instruments, etc., can solve the problems of unattractive consequences, cost addition to such designs, and alternative process-intensive computations

Active Publication Date: 2010-02-16
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a controller for an analog process that uses a delta-sigma modulator to measure the characteristic of the process and a set-point value to control it. The controller also includes a summer to form a difference between the measured characteristic and the set-point value. A control block is then used to select a partial sum based on the difference and produce a control signal for the process. The technical effect of this invention is to provide a more accurate and efficient control system for analog processes.

Problems solved by technology

In such cases, multiplication of a control error signal with constants (or variables) KP, KI, and KD in dedicated hardware is very area consuming for a custom integrated semiconductor device, which adds cost to such designs.
In digital controllers implemented with a general-purpose digital processor such as a microprocessor, process-intensive computation is the alternative and also the unattractive consequence.

Method used

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  • Oversampling PID controller for integration with a delta-sigma analog-to-digital converter
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  • Oversampling PID controller for integration with a delta-sigma analog-to-digital converter

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Embodiment Construction

[0012]The making and using of the presently preferred embodiments are discussed in detail below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.

[0013]The present invention will be described with respect to exemplary embodiments in a specific context, namely an oversampling PID controller for controlling an analog process. The oversampling PID controller includes a delta-sigma modulator producing a one-bit oversampled signal representing a measured output characteristic of the analog process, a delta-sigma modulator producing a one-bit oversampled signal representing a set-point value for the output characteristic, a summer forming a difference of these signals representing a control error signal, and a control block ...

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Abstract

An embodiment of the invention relates to a controller that includes a delta-sigma modulator to produce a one-bit, oversampled signal representing a measured characteristic of a process, and a delta-sigma modulator to produce a one-bit, oversampled signal representing a set-point value for the characteristic. A multiplexer selects a partial sum based on a difference of the oversampled signals to produce a control signal for the process. The controller that produces the control signal for the process can be a PID controller.

Description

TECHNICAL FIELD[0001]An embodiment of the invention relates generally to digital controllers and methods, and more particularly to a digital controller for providing a control signal employing a delta-sigma modulator.BACKGROUND[0002]In many state-of-the-art process control applications, a digital controller is used to control an analog process. A digital controller provides cost and performance advantages over corresponding analog controllers that would typically be employed in earlier controller designs. To integrate a digital controller into an analog process control loop, an output value from the analog process to be controlled must be converted into a digital representation in order to serve as an input to the digital controller core.[0003]A control loop including a digital controller can convert an analog process output value (“an output characteristic”) into a digital signal using a ΔΣ ADC (delta-sigma analog-to-digital converter). The result of this conversion is subtracted f...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H03M1/00
CPCG05B11/36
Inventor HARTLIEB, HEIMOSTROHMAYER, KLAUSHAUSMANN, MICHAEL
Owner INFINEON TECH AG